What is the phone number for the secretary of state in missouri? You can also talk to a live person of Missouri Secretary of State on phone or directly make a call to the corporate headquarters of Missouri Secretary of State . Phone Number: 573-751-4936. Call and Help Time: Average Wait: Unknown — 24 hours, 7 days. Reach a live person: Direct to corporate headquarter.What is the missouri secretary of state? Missouri (MO) Secretary of State – Corporation and Business Entity Search. Jason Kander is the current Secretary Of State of Missouri.Who is the secretary of missouri? The current Secretary of State of Missouri is John Ashcroft. Functionalities : The office of the Secretary of State acts as the Custodian of the Great Seal of Missouri. This office is also responsible for authenticating public documents and is the keeper of the public archives and records.